| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for inexpensively producing a silicon steel sheet remarkably improved in magnetic properties in the rolling direction compared to the conventional non-oriented silicon steel having magnetic properties in the width direction better than those of the conventional grain-oriented silicon steel sheet and particularly suitable as the stock for a dividedtype iron core. SOLUTION: A slab contg. <=0.01% C, 2.0 to 4.0%, Si, <=0.5% Mn, <=0.010% S, 0.003 to 0.020% sol.Al and 0.001 to 0.010% N is subjected to hot rolling and annealing, is thereafter subjected to primary cold rolling at a draft of 40 to 70%, process annealing and secondary cold rolling at a draft of 65 to 90%, is thereafter subjected to primary recrystallization annealing of executing rapid heating and holding at 850 to 950 deg.C for 5 sec to 10 min and is moreover subjected to secondary recrystallization annealing of executing holding at 750 to 1000 deg.C for 4 to 100 hr in a 100% hydrogen atmosphere. |
